Summary

I fired up the latest https://github.com/libp2p/rust-libp2p/tree/master/examples/browser-webrtc to discover there's an error in the browser console

Expected behavior

The example should ping back and forth between the server and browser, only 1 ping gets across before crashing

Actual behavior

After the first ping, the browser crashes

Relevant log output

Uncaught Error: closure invoked recursively or after being dropped
    at imports.wbg.__wbindgen_throw (browser_webrtc_example.js:668:15)
    at browser_webrtc_example_bg.wasm:0xbed3a
    at browser_webrtc_example_bg.wasm:0xb6add
    at __wbg_adapter_30 (browser_webrtc_example.js:208:10)
    at RTCDataChannel.real (browser_webrtc_example.js:193:20)

Possible Solution

I suspect one of the web_sys closures isn't being handled properly? It likely gets dropped and then called.

Version

libp2p 0.53.1
libp2p_webrtc 0.6.1-alpha

Would you like to work on fixing this bug ?

Maybe

### Tasks
- [ ] https://github.com/libp2p/rust-libp2p/pull/4952
- [ ] https://github.com/libp2p/rust-libp2p/pull/4966